- Added new discovery integrations (AWS Lightsail, Docker, DigitalOcean VPC label, Scaleway secret file), OAuth 2.0 support, a dark UI theme, and experimental remote write exemplar sending.
- Introduced configurable flags for environment variable expansion in external labels, TSDB block chunk size, label size/count limits, and humanize function string parsing; renamed a remote write metric for clarity.
- Fixed several panics in TSDB (WAL large records, mmaped memory, nil pointers) and UI errors (TSDB status page blank page, discovery restart behavior).
2.27.0 / 2021-05-12
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